Malicious PDF — malware analysis report

Static analysis result for SHA-256 0098cece5dc2ca45…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 18:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f3b7e657797a57b9ae992bb05b8a138e SHA-1: 7d4d5a8384e384f7eb72129438c583894ee02964 SHA-256: 0098cece5dc2ca454b89684385fb46ef74d31c1100fd4431a7c093060487db2a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm heuristic indicates a strong likelihood of redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ddf0eed1---kukisutizosigujato.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d05113354---felobamulatate.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/70258514785.pdfIn PDF document text
    • http://18554080.com/userfiles/file/fukoxowo.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/zavepawebipozejopatadepev.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210913233742.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/60234175395.pdfIn PDF document text
    • http://stefani.cz/fck/file/puzulovulebofavaluketoko.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/44848374513.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/3959086407.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b7545ab9fca092184b863b2268fb490b/kififimowofapogi.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/63369081485.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2c856338954646d77f00b030099437dd/99330030345.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/zifubebij.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/mitadizebo.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/47186042042.pdfIn PDF document text
    • http://mosjob.ru/images/file/fofilurelamotubo.pdfIn PDF document text
    • https://norservis.com/files/files/murobisuwux.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b304764f79---45498036314.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/32766568187.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/37500237466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=see+password+of+saved+wifi+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 10572 bytes
SHA-256: 58c2bd258c3f721df05e9c486ae5b2c0138654b91a128c8ac2205510325cdf59
font_02_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 18272 bytes
SHA-256: 189ffba3cf35a175ce79d0a1f2a9d6ec207c2211d2dbe11b6ab6d61b605722dc

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